When I try to install Plugins the Plugin Installer displays: "Some plugins require plugin Autopsy-Core to be installed.The plugin Autopsy-Core is requested in version >= 7.0.9 (release version 9) but only 10.1.12 (of release version different from 9) was found."

That means that the module depends on an older version of Autopsy. I wish the message were more obvious about what it meant. Some of the 3rd party plug-in modules were not updated to Autopsy 3.1.0. Modules should work for minor point releases (3.0.0, 3.0.1, etc.), but will likely stop working when we jump major versions.